added arrow print output flag (#21)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "gift_circle"
-version = "0.5.1"
+version = "0.6.0"
 edition = "2021"
 authors = ["Chuck King"]
 

README.md

@@ -50,6 +50,15 @@ Kenya Hill,kenya.hill@example.com,1,Daisy Jones
 Daisy Jones,daisy.jones@example.com,3,Jack Brown
 ```
 
+### Arrow Print
+
+If you just want a simple, single-line output that shows the name of folks and who they are assigned to give a gift to, you may use the -a/--arrow-print flag. The -a flag output will look like this:
+
+```shell
+cargo run --  -a -i=./src/example-participants.csv
+Beverly Jones -> Kenya Hill -> Billy Jones -> Jane Hill -> Daisy Jones -> Jack Brown -> Bill Jones -> Jessica Brown -> Joe Hill -> Beverly Jones
+```
+
 ## Code
 
 This code was written and compiled on an Intel-based MacBook Pro, so the release binary should work on any Intel-based Mac. If you have an Intel MacBook, you should be able to download the gift_cirle binary that is attached to the GitHub release, modify the permissions to make it executable (chmod +x gift_circle), and invoke it against your participants file as shown above.
@@ -60,6 +69,7 @@ If you have a different machine, you can install Rust for your machine, download
 cargo test
 cargo run -- --help
 cargo run -- --i=./src/example-participants.csv
+cargo run --  -a -i=./src/example-participants.csv
 cargo build
 ./target/debug/gift_circle --i=./src/example-participants.csv
 ```

src/main.rs

@@ -18,8 +18,6 @@ fn run() -> Result<()> {
     let mut rdr = csv::Reader::from_path(args.input.clone())
         .with_context(|| format!("Failed to read input from {}", &args.input))?;
 
-    let mut wtr = csv::Writer::from_writer(io::stdout());
-
     let mut participants: Vec<Person> = vec![];
 
     for result in rdr.deserialize() {
@@ -28,11 +26,25 @@ fn run() -> Result<()> {
     }
 
     let gift_circle = get_gift_circle(participants)?;
-    for person in gift_circle {
-        wtr.serialize(person)?;
-    }
 
-    Ok(wtr.flush()?)
+    if args.arrow_print {
+        let mut names = gift_circle
+            .iter()
+            .map(|p| p.name.clone())
+            .collect::<Vec<_>>();
+        // Add the first person to the end to wrap the circle
+        let first_person = &names.first().unwrap().clone();
+        names.push(first_person.to_string());
+
+        println!("{}", &names.join(" -> "));
+        Ok(())
+    } else {
+        let mut wtr = csv::Writer::from_writer(io::stdout());
+        for person in gift_circle {
+            wtr.serialize(person)?;
+        }
+        Ok(wtr.flush()?)
+    }
 }
 
 fn main() {

src/myargs.rs

@@ -5,8 +5,10 @@ use clap::Parser;
 #[command(author, version, about, long_about = None)]
 pub struct Args {
     /// Input file
-    #[arg(short, long)]
+    #[arg(long, short)]
     pub input: String,
+    #[clap(long, short, action)]
+    pub arrow_print: bool,
 }
 
 pub fn get_args() -> Args {